The selling price of flat a and b are $1000000 and $1500000 respectiverly , and they are increased and decreased by x% each year respectively.
A) Find the value of x if selling prices of flat A and B are the same after 1 years.
B)It is found that the profit % of flat A is 20% and the ;oss % of flat B is 25% respectively after first year , find the cost prices of flat A and B.
7, 13, 25, 49 , 97 193
guess the general term of the sequence
全部要steps
f.1 maths
2008-02-22 4:17 am
回答 (3)
2008-02-22 4:32 am
✔ 最佳答案
Tlhe value of x selling prices of flat A and B are the same after 1 years1000000X(1+0.01x)=1500000X(1-0.01x)
1000000+10000x=1500000-15000x
25000x=500000
x=20
6
2008-02-21 20:37:10 補充：
general term of the sequence=3X2^n 1
2008-02-21 20:41:19 補充：
cost price of flat A=1000000X(1 0.2)(1 0.2)=1440000cost price of flat B=1500000(1 0.2)(1 0.25)=2250000
2008-02-21 20:41:39 補充：
cost price of flat A=1000000X(1 0.2)(1 0.2)=1440000cost price of flat B=1500000(1 0.2)(1 0.25)=2250000
2008-02-21 23:07:15 補充：
general term of the sequence=3X2^n 1
2008-02-22 7:18 am
其實... X%係針對邊個數?...如果你就咁問...我會咁答
A)1000000+1000000xX%=1500000-1500000xX%
1000000+10000X=1500000-15000X
25000X=500000
X=20
B) flat a 1000000/(1+20%)=833333 1/3
flat b 1500000/(1-25%)=2000000
2.sorry...比唔到個step你....我覺得係1+3x2(唔識打n次方)文字解說...1加3乘2..2要n次方(剩係2要)
我好比心機計架...希望幫到你啦=]
A)1000000+1000000xX%=1500000-1500000xX%
1000000+10000X=1500000-15000X
25000X=500000
X=20
B) flat a 1000000/(1+20%)=833333 1/3
flat b 1500000/(1-25%)=2000000
2.sorry...比唔到個step你....我覺得係1+3x2(唔識打n次方)文字解說...1加3乘2..2要n次方(剩係2要)
我好比心機計架...希望幫到你啦=]
2008-02-22 4:22 am
7, 13, 25, 49 , 97 193
13=7x2-1
2n-1
13=7x2-1
2n-1
收錄日期: 2021-04-13 15:20:22
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